package top.banner.contentcenter.configuration;

import com.alibaba.nacos.api.exception.NacosException;
import com.alibaba.nacos.api.naming.NamingService;
import com.alibaba.nacos.api.naming.pojo.Instance;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.AbstractLoadBalancerRule;
import com.netflix.loadbalancer.BaseLoadBalancer;
import com.netflix.loadbalancer.Server;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.alibaba.nacos.NacosDiscoveryProperties;
import org.springframework.cloud.alibaba.nacos.ribbon.NacosServer;

import javax.annotation.Resource;

/**
 * @author XGL
 */
@Slf4j
public class NacosWeightedRule extends AbstractLoadBalancerRule {
    @Resource
    private NacosDiscoveryProperties nacosDiscoveryProperties;

    @Override
    public void initWithNiwsConfig(IClientConfig iClientConfig) {
        //读取配置文件，并初始化NacosWeightedRule
    }

    @Override
    public Server choose(Object key) {
        try {
            BaseLoadBalancer loadBalancer = (BaseLoadBalancer) this.getLoadBalancer();
            //想要获取微服务的名称。
            String name = loadBalancer.getName();

            //拿到服务发现的相关Api
            NamingService namingService = nacosDiscoveryProperties.namingServiceInstance();

            //nacos client自动通过基于权重的负载均衡算法返回一个实例。
            Instance instance = namingService.selectOneHealthyInstance(name);

            log.info("选择的实例是：port：{} instance：{}", instance.getPort(), instance);
            return new NacosServer(instance);
        } catch (NacosException e) {
            return null;
        }

    }
}
